A sump pump is an automatic water-removal pump installed in a basin (“sump pit”) in the lowest part of a basement or crawlspace. When water collects in the pit, a float switch activates the pump, which pushes the water out through a discharge line and away from the foundation — keeping the lower level dry.

How it works

  • Water enters the sump pit from drain tile or groundwater
  • Float switch detects rising water level
  • Pump activates and pushes water up the discharge pipe
  • Check valve prevents backflow into the pit
  • Pump shuts off once water level drops

See sump pump service, plus leak detection for hidden water issues.